Towards More Accurate Determination of the Thermoelectric Properties of Bi₂Se₃ Epifilms by Suspension via Nanomachining Techniques.

ABSTRACT: We report on the characterization of the thermoelectric properties of Bi₂Se₃ epifilms. MBE-grown Bi₂Se₃ films on GaAs (111) A are nanomachined with integrated Pt elements serving as local joule heaters, thermometers, and voltage probes. We suspended a 4 µm × 120 µm Bi₂Se₃ by nanomachining techniques. Specifically, we selectively etched GaAs buffer/substrate layers by citric acid solution followed by a critical point drying method. We found that the self-heating 3ω method is an appropriate technique for the accurate measurement of the thermal conductivity of suspended Bi₂Se₃. The measured thermoelectric properties of 200 nm thick Bi₂Se₃ at room temperature were κ=1.95&nbs

SUBMITTER: Kim D 

PROVIDER: S-EPMC9609336 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature